TB 9-4931-491-24
12. RF Output Flatness
a. Performance Check
(1) Set MODE switch to CW.
(2) Connect sensor module to the power reference output. Zero and calibrate sensor.
(3) D i s c o n n e c t s e n s o r m o d u l e f r o m p o w e r r e f e r e n c e o u t p u t a n d c o n n e c t t o
T I R F OUTPUT.
(4) Configure measuring receiver for Tuned RF level measurement.
(5) Set OUTPUT switch to +10 dBm.
(6) Adjust CENT FREQ controls slowly across the entire band (10-500 MHz).
(7) Using measuring receiver and tuned level techniques, note frequency where
maximum output is obtained.
(8) Adjust CENT FREQ to frequency noted in (6) above.
(9) Adjust OUTPUT vernier control until measuring receiver indicates +10 dBm.
(10) Adjust CENT FREQ controls slowly across entire band and note the minimum
output indication.
(11) Measuring receiver will indicate at least +8.5 dBm across entire band.
b. Adjustments. No adjustments can be made.
13. Attenuator Accuracy
a. Performance Check
(1) Connect measuring receiver sensor module to the power reference output. Zero
and calibrate sensor.
(2) D i s c o n n e c t s e n s o r m o d u l e f r o m p o w e r r e f e r e n c e o u t p u t a n d c o n n e c t t o
T I R F OUTPUT.
(3) Configure measuring receiver for Tuned RF level measurement.
(4) Position controls as listed in (a) through (c) below:
(a) MODE switch to CW.
(b) CENT FREQ control to 250 MHz.
(c) OUTPUT control to 0 dBm.
(5) Tune measuring receiver to 250 MHz (.250 GHz) with a 0.000 reference.
(6) Set OUTPUT control to -10 dBm.